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【题目】 Is our Wechat account safe?

Yes, nobody can use it _________ they have the password.

A.ifB.whenC.unlessD.since

【答案】C

【解析】

句意:——我们的微信账号安全吗?——是的,除非有密码,否则任何人都不能使用它。

考查连词。if如果;when当……时;unless除非,如果不;since自从;根据句意理解可知,空格前后两句之间是条件关系,且这里表达的“除非”,所以应该用unless,故选C

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